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          <div class="mdui-card-primary-title">Android14 屏蔽ANR和Crash弹窗</div>
          <div class="mdui-card-primary-subtitle"><i class="iconfont">&#xe697;</i> 2024-09-07 / <i class="iconfont">&#xe601;</i> 龙之叶 &nbsp;&nbsp; <span id="busuanzi_container_page_pv" style="display: none;"><i class="iconfont">&#xe7fd;</i> <span id="busuanzi_value_page_pv"></span></span></div>
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      <h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h1><p>Android系统在应用发生Crash/ANR的时候，总会弹出一个提示对话框，但是现在部分客户不想要这样的对话框，要求移除</p>
<h2 id="一、Application-Crash"><a href="#一、Application-Crash" class="headerlink" title="一、Application Crash"></a>一、Application Crash</h2><h4 id="表现：-程序崩溃或闪退，界面上通常会出现“应用已停止运行”的提示。"><a href="#表现：-程序崩溃或闪退，界面上通常会出现“应用已停止运行”的提示。" class="headerlink" title="表现： 程序崩溃或闪退，界面上通常会出现“应用已停止运行”的提示。"></a>表现： 程序崩溃或闪退，界面上通常会出现“应用已停止运行”的提示。</h4><h4 id="常见原因（Java异常）："><a href="#常见原因（Java异常）：" class="headerlink" title="常见原因（Java异常）："></a>常见原因（Java异常）：</h4><table>
<thead>
<tr>
<th>错误类型</th>
<th>详细描述</th>
</tr>
</thead>
<tbody><tr>
<td>NullPointerException</td>
<td>尝试在需要对象的地方使用了null。</td>
</tr>
<tr>
<td>SQLException</td>
<td>数据库操作错误，如SQL语句错误、数据库连接问题等。</td>
</tr>
<tr>
<td>ClassCastException</td>
<td>尝试将对象强制转换为不是其实例的子类。</td>
</tr>
<tr>
<td>NumberFormatException</td>
<td>将字符串转换为数字时格式不正确。</td>
</tr>
<tr>
<td>ClassNotFoundException</td>
<td>尝试加载的类在类路径中找不到。</td>
</tr>
<tr>
<td>ArithmeticException</td>
<td>数学运算错误，如除以零。</td>
</tr>
<tr>
<td>ArrayIndexOutOfBoundsException</td>
<td>数组索引越界。</td>
</tr>
<tr>
<td>IllegalArgumentException</td>
<td>向方法传递了非法或不适当的参数。</td>
</tr>
<tr>
<td>IllegalAccessException</td>
<td>尝试访问或修改类的字段，但当前方法没有足够的访问权限。</td>
</tr>
<tr>
<td>ArrayStoreException</td>
<td>试图将错误类型的对象存储到数组中。</td>
</tr>
</tbody></table>
<h4 id="Native-Crash（C-层）："><a href="#Native-Crash（C-层）：" class="headerlink" title="Native Crash（C++层）："></a>Native Crash（C++层）：</h4><p>Native Crash发生在C++代码层，Java层难以直接捕获错误信息，通常表现为应用闪退。可通过Monkey测试等自动化测试工具进行监控。</p>
<h4 id="具体原因："><a href="#具体原因：" class="headerlink" title="具体原因："></a>具体原因：</h4><ul>
<li>设备碎片化：不同设备间的兼容性问题。</li>
<li>网络问题：带宽不足、网络切换等。</li>
<li>内存管理：内存泄漏、非授权内存访问等。</li>
<li>用户负载：高并发用户导致的资源竞争。</li>
<li>代码错误：空指针访问、非法指令执行等。</li>
<li>第三方服务：如广告插件或第三方库的不稳定。</li>
</ul>
<h4 id="测试中如何关注："><a href="#测试中如何关注：" class="headerlink" title="测试中如何关注："></a>测试中如何关注：</h4><ul>
<li>界面操作验证：确保所有按钮、控件操作有效，响应正确。</li>
<li>负载测试：通过自动化工具进行长时间或高负载测试，暴露潜在问题。</li>
<li>重复操作测试：多次重复相同操作，检查是否出现崩溃。</li>
<li>异常输入测试：对输入框进行非标准输入，检查应用的容错能力。</li>
</ul>
<h4 id="解决方法："><a href="#解决方法：" class="headerlink" title="解决方法："></a>解决方法：</h4><ul>
<li>查看日志文件中的am_crash相关条目，定位崩溃点。</li>
<li>根据日志中的堆栈跟踪，分析并修复代码问题。</li>
</ul>
<h1 id="二、ANR（Application-Not-Responding）"><a href="#二、ANR（Application-Not-Responding）" class="headerlink" title="二、ANR（Application Not Responding）"></a>二、ANR（Application Not Responding）</h1><p>表现： 应用无响应，用户界面卡住，系统弹出等待或强制关闭的对话框。</p>
<h4 id="对应用的影响："><a href="#对应用的影响：" class="headerlink" title="对应用的影响："></a>对应用的影响：</h4><ul>
<li>用户体验差，可能导致用户流失。</li>
<li>操作中断，可能造成数据丢失。</li>
</ul>
<h4 id="产生原因："><a href="#产生原因：" class="headerlink" title="产生原因："></a>产生原因：</h4><ul>
<li>主线程阻塞：UI线程在5秒内未响应输入事件。</li>
<li>BroadcastReceiver超时：未在10秒内完成处理并返回。</li>
</ul>
<h4 id="根本原因："><a href="#根本原因：" class="headerlink" title="根本原因："></a>根本原因：</h4><ul>
<li>主线程执行了耗时的IO操作（如数据库读写、网络请求）。</li>
<li>CPU资源被其他应用或线程占用，导致主线程得不到足够的时间片。</li>
</ul>
<h4 id="测试中如何关注：-1"><a href="#测试中如何关注：-1" class="headerlink" title="测试中如何关注："></a>测试中如何关注：</h4><ul>
<li>耗时操作监控：关注上传大文件、保存复杂数据等操作的响应时间。</li>
<li>网络压力测试：在网络状况不佳或变化时测试应用稳定性。</li>
<li>Monkey测试：通过随机事件生成器模拟用户操作，检测ANR问题。</li>
<li>内存和CPU监控：在多任务、多线程场景下监测资源使用情况。</li>
</ul>
<h4 id="解决方法：-1"><a href="#解决方法：-1" class="headerlink" title="解决方法："></a>解决方法：</h4><ul>
<li>在log文件夹中搜索am_anr或activitymanager: ANR，查找ANR日志。</li>
<li>分析<a href="mailto:&#x64;&#97;&#116;&#97;&#x5f;&#97;&#x70;&#x70;&#x5f;&#97;&#110;&#114;&#64;&#x78;&#x78;&#120;&#46;&#x74;&#120;&#x74;">&#x64;&#97;&#116;&#97;&#x5f;&#97;&#x70;&#x70;&#x5f;&#97;&#110;&#114;&#64;&#x78;&#x78;&#120;&#46;&#x74;&#120;&#x74;</a>文件中的异常堆栈，特别是主线程（main prio=5 tid=1）的阻塞情况。</li>
<li>根据日志信息，优化代码，避免在主线程中执行耗时操作，或使用异步编程模型处理耗时任务。</li>
</ul>
<h1 id="代码示例"><a href="#代码示例" class="headerlink" title="代码示例"></a>代码示例</h1><p>在常规开发中，经常遇到手机性能较低，以上优化方法提升不大的情况下，建议直接屏蔽弹窗</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br></pre></td><td class="code"><pre><span class="line">diff --git a/frameworks/base/services/core/java/com/android/server/am/ErrorDialogController.java b/frameworks/base/services/core/java/com/android/server/am/ErrorDialogController.java</span><br><span class="line">old mode <span class="number">100644</span></span><br><span class="line"><span class="keyword">new</span> <span class="title class_">mode</span> <span class="number">100755</span></span><br><span class="line">index 82f35adbb13..a0942face68</span><br><span class="line">--- a/frameworks/base/services/core/java/com/android/server/am/ErrorDialogController.java</span><br><span class="line">+++ b/frameworks/base/services/core/java/com/android/server/am/ErrorDialogController.java</span><br><span class="line">@@ -<span class="number">35</span>,<span class="number">6</span> +<span class="number">35</span>,<span class="number">9</span> @@ <span class="keyword">final</span> <span class="keyword">class</span> <span class="title class_">ErrorDialogController</span> &#123;</span><br><span class="line">     <span class="keyword">private</span> <span class="keyword">final</span> ActivityManagerService mService;</span><br><span class="line">     <span class="keyword">private</span> <span class="keyword">final</span> ActivityManagerGlobalLock mProcLock;</span><br><span class="line"> </span><br><span class="line">+    <span class="comment">// Create by yeruilai 2024-8-29 15:57:56 Block ANR and Crash error dialogs</span></span><br><span class="line">+    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="type">boolean</span> <span class="variable">mShowDialog</span> <span class="operator">=</span> !Build.IS_USER;</span><br><span class="line">+</span><br><span class="line">     <span class="comment">/**</span></span><br><span class="line"><span class="comment">      * Dialogs being displayed due to crash.</span></span><br><span class="line"><span class="comment">      */</span></span><br><span class="line">@@ -<span class="number">179</span>,<span class="number">7</span> +<span class="number">182</span>,<span class="number">13</span> @@ <span class="keyword">final</span> <span class="keyword">class</span> <span class="title class_">ErrorDialogController</span> &#123;</span><br><span class="line">                 dialogs = mCrashDialogs;</span><br><span class="line">             &#125;</span><br><span class="line">             <span class="keyword">if</span> (dialogs != <span class="literal">null</span>) &#123;</span><br><span class="line">-                forAllDialogs(dialogs, Dialog::show);</span><br><span class="line">+                <span class="comment">// Create by yeruilai 2024-9-2 10:24:07 Block ANR and Crash error dialogs</span></span><br><span class="line">+                <span class="comment">// forAllDialogs(dialogs, Dialog::show);</span></span><br><span class="line">+                <span class="keyword">if</span>(mShowDialog) &#123;</span><br><span class="line">+                    forAllDialogs(dialogs, Dialog::show);</span><br><span class="line">+                &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">+                    forAllDialogs(dialogs, Dialog::dismiss);</span><br><span class="line">+                &#125;</span><br><span class="line">             &#125;</span><br><span class="line">         &#125;);</span><br><span class="line">     &#125;</span><br><span class="line">@@ -<span class="number">193</span>,<span class="number">7</span> +<span class="number">202</span>,<span class="number">13</span> @@ <span class="keyword">final</span> <span class="keyword">class</span> <span class="title class_">ErrorDialogController</span> &#123;</span><br><span class="line">             <span class="keyword">final</span> <span class="type">Context</span> <span class="variable">c</span> <span class="operator">=</span> contexts.get(i);</span><br><span class="line">             mAnrDialogs.add(<span class="keyword">new</span> <span class="title class_">AppNotRespondingDialog</span>(mService, c, data));</span><br><span class="line">         &#125;</span><br><span class="line">-        scheduleForAllDialogs(mAnrDialogs, Dialog::show);</span><br><span class="line">+        <span class="comment">// Create by yeruilai 2024-9-2 10:24:07 Block ANR and Crash error dialogs</span></span><br><span class="line">+        <span class="comment">// scheduleForAllDialogs(mAnrDialogs, Dialog::show);</span></span><br><span class="line">+        <span class="keyword">if</span>(mShowDialog) &#123;</span><br><span class="line">+            scheduleForAllDialogs(mAnrDialogs, Dialog::show);</span><br><span class="line">+        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">+            scheduleForAllDialogs(mAnrDialogs, Dialog::dismiss);</span><br><span class="line">+        &#125;</span><br><span class="line">     &#125;</span><br><span class="line"> </span><br><span class="line">     <span class="meta">@GuardedBy(&quot;mProcLock&quot;)</span></span><br></pre></td></tr></table></figure>

      
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